What is the Greatest Common Factor of 21240 and 21260?

Greatest common factor (GCF) of 21240 and 21260 is 20.

GCF(21240,21260) = 20

We will now calculate the prime factors of 21240 and 21260, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21240 and 21260.

How to find the GCF of 21240 and 21260?

We will first find the prime factorization of 21240 and 21260. After we will calculate the factors of 21240 and 21260 and find the biggest common factor number .

Step-1: Prime Factorization of 21240

Prime factors of 21240 are 2, 3, 5, 59. Prime factorization of 21240 in exponential form is:

21240 = 2³ × 3² × 5¹ × 59¹

Step-2: Prime Factorization of 21260

Prime factors of 21260 are 2, 5, 1063. Prime factorization of 21260 in exponential form is:

21260 = 2² × 5¹ × 1063¹

Step-3: Factors of 21240

List of positive integer factors of 21240 that divides 21240 without a remainder.

1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 18, 20, 24, 30, 36, 40, 45, 59, 60, 72, 90, 118, 120, 177, 180, 236, 295, 354, 360, 472, 531, 590, 708, 885, 1062, 1180, 1416, 1770, 2124, 2360, 2655, 3540, 4248, 5310, 7080, 10620

Step-4: Factors of 21260

List of positive integer factors of 21260 that divides 21240 without a remainder.

1, 2, 4, 5, 10, 20, 1063, 2126, 4252, 5315, 10630

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21240 and 21260. The biggest common factor number is the GCF number.
So the greatest common factor 21240 and 21260 is 20.

Also check out the Least Common Multiple of 21240 and 21260